VII 



MOLLUSGA—THE ALIMENTARY GANAL 



193 



3. Scaphopoda. 



The mid-gut of Deiitalium (Fig. 165) consists of a looped stomachal tube bent 



Fig. 165. — Alimentary canal, kidney, and sezual organs of Dentalium, from behind (after 

 Lacaze-Duthiers and Leuckart combined), a, Mouth ; &, leaf-like oral tentacles ; c, snout ; d, 

 entrance to pharynx ; e, pharynx with radula, /; g, hind-gut ; h, right kidney ; i, anus ; k, right 

 nephridial aperture ; I and q, ducts of the digestive gland, n : m and o, gonad ; n and p, digestive 

 gland (liver) ; r, left nepliridial aperture ; s, left kidney ; t, stomach ; w, pharynx ; v, lobes or sails 

 on which the filamentous tentacles are placed. 



back on itself, and of a small intestine lying in a tangled coil behind the oesophagus. 

 VOL. II 



